Stastny either will be the Blues’ No. 2 center behind David Backes, or it’s possible that the captain might shift to the wing and allow Stastny to move into his spot on the top line.

The Blues needed to acquire more scoring, size and power-play skill down the middle after center ice proved to be a major weakness in their first-round playoff series against the Chicago Blackhawks. After taking a 2-0 series lead, the Blues lost four straight games and scored a total of five goals in those four defeats.

As for the Colorado Avalanche, the loss of Stastny will hurt, but it’s not a catastrophic event. This move will allow reigning Calder Trophy winner Nathan MacKinnon to move from the wing to center, which is his natural position. Colorado’s 1-2 punch at center featuring MacKinnon and Matt Duchene is one of the best in the league.

The Avalanche now have salary-cap space to bolster their blue line.

Have a Bruins/NHL question for Nick Goss? Send it to him via Twitter at @NickGossNESN